How can I create in Jive a recurrent task - the task form is really basic- Is it possible to customise it with? Or can we import an excel list as Task_ list (like in Sharepoint with the feature Import spreadsheet.)

If I wanted to set up daily, weekly or monthly updates sent from our Jive community to people in a certain group with discussions and uploads do you think announcements is a better way to do it or should I create a project and create them as tasks?

If you want to ensure all members of a group get an update then announcements in that group are going to appear in each members' Communications Stream, and they can link to the other content you want to draw their attention to.

If you want to ensure you remind yourself to do it, then setting up a project and assigning yourself the repeating task to create the announcements will help to manage your workload as you will get you Actions stream alerting you of impending due tasks